Rivet set forming tool



0v. 2Q, 1945. KELLER RIVET SET FORMING TOOL 2 Sheets-Sheet 1 Filed May6, 1943 Nov. 20, 1945. F. E. KELLER RIVET SET FORMING TOOL Filed May 6,1945 2 Sheets-Sheet 2 Patented Nov. 20, 1945 dUNlTED STATES PATENTOFFICE' RIVET SET FORMING TOOL Frank E. Keller, Wichita, Kans.

Application May 6, 1943, Serial No. 485,848

2 Claims.

My invention relates to a rivet set forming tool. The purpose of thistool is to out quickly and accurately the hollow in the end of a rivetset to conform to the contour of the rivet head to be driven.

A further object of the invention is to provide a tool of the kindmentioned that may beafiixed to any standard lathe whereby the work(rivet set shaft), may be turned against the cutting tool to form thehollow end of the rivet set.

A'further object is to provide a tool of the kind mentioned that isaccurate in its work, one that is substantial and durable, a tool thatis moderate in cost as well as being simple in construction andsimple'and easy to use. These and other objects will be more fullyexplained as this description progresses.

Now referring to the accompanying drawings Fig. 1 is a perspective viewof a lathe and showing my improved rivet set forming tool mounted on thetail stock spindle of the lathe.

Fig. 2 is an enlarged detail perspective view of my rivet set formingtool positioned ready to make the forming cut on the rivet set stock.

Fig. 3 is an enlarged perspective view of the rivet set stock mounted inthe lathe chuck and in position, in relation to Fig. 2, to be cut by thetool.

Fig. 4 is a perspective view of the end of the rivet set after the outhas been made in the end thereof.

Fig. 5 is a perspective detail view of the back and side of rivet setforming device.

Fig. 6 is an enlarged perspective and sectional view of the cutting tooland the tool holder portion of the device.

Fig. '7 is a detail side view of the rivet set forming tool, parts ofwhich are broken away and shown in section for convenience ofillustration.

F Fig. 8 is a rear view of the device as shown in Fig. 9 is a face orfront view of the rivet set forming tool as shown in Fig. '7.

Fig. 10 is a side view of the rivet set, the end of which is shown insection and the cutting tool is shown in position to be rocked to makethe cut that is to be made as indicated by the dotted line.

Fig. 11 i a side view of the rivet set, the end of which is shown insection and the cutting tool is in position arrived at after the cut inthe end of the rivet set has been made.

Similar numerals of reference designate the same parts throughout theseveral figures of the drawings.

In the drawings is shown my improved rivet set forming tool as having ashank I2 that has a bore I3 longitudinally positioned therein for thereception of the tail stock spindle I 4 of the tail stock I5 of thelathe. The shank I2 is provided with set screws I6 that are threadedthrough the wall of the shank I2 and extend into the bore I3 so thatwhen the shank I2 is placed on the tail stock spindle I4 it may berigidly set and held thereon by the tightening of the set screws I6. Onone end of the shank I2 is integrally formed a face plate I'l.

Against and around the face plate I! is positioned a cup like elementhaving a plate I8 and a flange I9 that is integrally formed on the plateI8. The plate I8 is solidly held against the face plate I! by means ofbolts 20 that pass loosely through holes 2| in the face plate I! and arethreaded into the plate I8. Through the flange I9 and spaced ninetydegrees apart are threaded four screws 22' the inner ends of which bearagainst the edge of the face plate II so that by tightening andloosening the diametrically positioned screws 22 the cup shaped elementI8I9 may be slightly shifted on and in parallelism with the face plate Hfor centering purposes as will later be explained.

Integrally formed on the element I 8-I 9 is a pair of support elements23 and 24 that are in alignment and are concentric with the flange I9.

Between the supports 23 and 24 is a yoke tool carrying element 25, thelower end of which is cone shaped as at 25a and is revolvably seated ina cone shaped bearing in the end of a screw 26 that is th'readed throughthe support 24, there being a lock nut 21 threaded on the screw 26 andadapted to engage the outer face of the support 24 upon the turning ofthe nut 21 on the screw 26 so as to definitely lock the screw 26 in itsadjusted position. The upper end of the yoke 25 is provided with aconical portion, the apex end of which terminates with a round shaft 28that is integrally formed thereon and revolvably passes through a bore29 that is axially positioned in a screw 39 and the lower end of whichis cone shaped to form a bearing in which the cone portion 251) of theyoke 25 is revolvably seated. 'I'h'e screw 39 being threaded through thesupport 23 and there being a lock nut 3| threaded on the screw 30 andadapted to engage the face of the support 23 to lock the screw 30 in itsadjusted position as will be readily understood.

The device is provided with a handle 32, one end of which is providedwith a hole 33 and a cut 34 extending from the inner end of the handle32 to the hole 33, there being a clamp screw 35 passing through the endson either side of the cut 34 and being threaded into ne of said ends sothat the upper end of the shaft 28 may be positioned in the hole 33 andthe screw 35 tightened to rigidly tighten and hold the handle 32 on theshaft 28 so that the yoke 25 may be revolved by the swinging of thehandle 32.

The yoke 25 is a curved element and the central portion has two fiatfaces 36 and 31 set at an angle of ninety degrees to each other and theline of intersection of these two faces 38 and 3'! lies on the axis AAof the bearingsupporting the yoke 25 regardless of any position to whichthe yoke 25 may be swung about the axis AA.

The side 36 of the yoke 25 is provided with a horizontally positionedtool seat 38 in which a cutting tool 39 is positioned so that the outerface 39a of the tool 39 is substantially flush with the face 36 of theyoke 25.

The yoke 25 is provided with a bolt 40 that passes through the yoke 25in such a manner that the head 49a of the bolt 49 overlaps the edgeportion of the face 39a of the tool 39. The other end of the screw 49projects beyond the rear face of the yoke 25 and is threaded to receivea nut 4| that is threaded thereon and functions when the nut 4! isturned, to draw the screw 40 rearwardly so that the head 49a thereofrigidly binds the tool 39 in its adjusted position in the tool seat 38.

At 42 is shown a curved piece of metal that is rigidly attached to theyoke 25 and is bent in the form of an arc of a circle whose center lieson the axis AA of the yoke bearings, the object of which will later beexplained.

In Fig. 1 is shown a lathe having a chuck 43 for holding the work to beworked on and having my improved rivet set forming tool mounted on thecenter shaft M of the tail stock l of the lathe, the center shaft 14being movable toward and away from the chuck 43 by the turning of thehand wheel 44 in the usual manner.

The operation of the device is as follows. The

' stock 45 from which the rivet set is to be made is placed in the chuck43 and centered therein in the usual manner. Now the cut that is to bemade in the end of the stock 4.5 is a concave hemispherical or a smallerpart of a sphere in shape as shown at :6, therefore the outer point 39bof the tool 39 must be set the distance of the radius of the cut to bemade from the axis line AA. The tool 33 may be accurately set by settinga micrometer to span from the outside of the curved piece 42 to the face3! which would be on the axis line AA. This having been done themicrometer is opened up enough more to exactly include the radius of thecut that is to be made. Now the tool 39 may be slidably positioned inthe tool seat 38 and one contact point of the micrometer placed againstthe outside of the curved piece of metal 42 and then the tool slipped toa projected position until the point of the tool engages the othercontact of the micrometer, whereupon the nut 4i may be turned on thebolt 40 and the head 49a of the bolt 40 will engage and rigidly bind andhold the tool 39 in its properly adjusted position preparatory formaking the desired cut.

This having been done the lathe is started and the chuck 43 and stock 45therein is revolving. Now the tail stock !5 is moved so that the tool 39is adjacent the end of the stock 45 and thereby swinging the handle 32the tool 39 will be rocked so that the mechanic operating the device cantell definitely whether or not the tool 39 is exactly in the position hewants it to make the cut he intends to make. If the tool is not in thedesired position the tool may be slightly shifted sideways or up or downby loosening and tightening the diametrically positioned screws 22. Thetool 39 having been thus properly positioned is now ready to make thecut indicated by the dotted line 46a. The adjusting wheel 44 of thelathe may now be turned so as to space the tool a short distance fromthe end of the stock 45 and in the position shown in Fig. 10, the handle32 may now be swung to turn the tool 39 to the position shown in Fig.11, whereupon the out has been partially made. Now the handle is swungto return the tool to the position shown in Fig. 10 and by turning theadjusting wheel 44, the tool is moved a little closer to the stock 45and the handle 32 is again swun so the tool 39 moves again to theposition shown inFig. ll, whereupon an additional out has been taken.and this process is continued until the face 36 of the yoke 25 engagesthe end of the stock 45 whereupon the handle 32 may again be swun tomove the tool 39 to the position shown in Fig. 11 and the final out hasbeen made and the form 46 for the rivet set is completed.

The machine having once been set up as above described numerous stocks45 may be successively placed in the chuck 43 and the rivet sets may bequickly and accurately turned out in large numbers.

Such modifications of my invention may be employed as lie within thescope of the appended claims without departing from the spirit andintention of my invention. Now having fully shown and described myinvention, what I claim is:

1. In a rivet set forming tool; a face plate and a hollow shank thereonfor the snug reception of the tail stock spindle of a lathe, a flangedplate having bearing support legs thereon, a tool carrying yoke, saidtool carrying yoke being revolvably carried in bearings on said bearingsupport legs and handle means connected to said tool carrying yokeelement for swinging the yoke about an axis passing through the yokebearings, and means for holding the second said plate against the firstsaid face plate to maintain parallelism of the second said plate and thefirst said face plate, and means for shifting the second said plate in aplane parallel to the first said face plate, and means for rigidlyholding the second said plate in adjusted positions against the firstsaid face plate for the purpose described.

2. In a rivet set forming tool as defined in claim 1; the second saidplate having a rear-- wardly extending flange thereon whose insidediameter is greater than the outside diameter of the first said faceplate, said means for holding the second said plate against the firstsaid face plate bein a plurality of screws each of which pass through aloose fitting hole in the first said face plate and threaded into thesecond said plate, said means for shifting the second said plate being aplurality of screws threaded through the said flange of the second saidplate and spaced therearound, the inside ends of said screws in theflange engaging the edge of the first said face plate to effect theshifting of the second said plate against the first said face plate uponthe turning of the screws as shown and described.

FRANK E. KELLER.

